Electrical audio signal processing systems and devices – Binaural and stereophonic
Patent
1988-03-10
1990-03-13
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
381 17, 381 18, 381 98, H04S 100
Patent
active
049088580
ABSTRACT:
A stereo processing system which comprises a left channel and a right channel; a filter in each of the channels for separating an audio signal into a plurality of bands; a phase-shift/delay circuit in each of the channels for receiving a portion of the output of the corresponding filter and phase-shifting and delaying the received signal for each of the separated bands; a pair of input/output circuits interconnecting the left channel and the right channel for exchanging the signals between the two phase-shift/delay circuits for mixing the signal received from the filter of the left channel with the signal received from the phase-shift/delay circuit of the right channel in the phase-shift/delay circuit of the left channel and vice versa; a mixing circuit in each of the channels for mixing the signal received from the output of the corresponding filter with the output of the corresponding phase-shift/delay circuit; and a phase detector/delay circuit coupled to the outputs of the mixing circuits of the left and the right channels for detecting and delaying a portion of the signal received from the mixing circuit of the left channel having a 180.degree. phase-shift with respect to the signal received from the mixing circuit of the right channel and vice versa.
REFERENCES:
patent: 4121059 (1978-10-01), Nakabayashi
patent: 4137510 (1979-01-01), Iwahara
patent: 4525857 (1985-06-01), Orban
patent: 4748669 (1988-05-01), Klayman
Hidaka Kenjiro
Isen Forester W.
Johansen W. Edward
Kabushiki Kaisha Asaplan
Ohno Matsuo
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